In this vid, geek goddess of all things awesome, Jeri Ellsworth, details how she made her own NMOS transistors using a a kiln, rust and stain remover, Emulsitone spin on dopant, wafer she scored on eBay, and some vinyl sign-making material.

Homebrew NMOS Transistor Step by Step – So Easy Even Jeri Can Do It

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.

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